But choice gives you power. Try installing a minimal Debian in a virtual
machine. Try adding more packages and a desktop environment.

suggest me what can I do? how should I proceed? how should I go further in
the field of Linux? and what can I do with and how to go further in python?

I recommend learning Linux and Python by using them wherever possible.
What are your areas of interest? Games? Science? You could start a tiny
Python project. A great way to learn from others is to contribute to an
open source project.

My one more query is that there is no any alternative available in linux
for Corel draw, MS office, video editing software. Although there are many
claims of alternatives but the reality is harsh, they are not as simple and
productive as the windows software. Please clear my view regarding this
also.

I meet all my office needs with LibreOffice. If you prefer Windows
offerings, you can run Debian in a virtual machine and have the best of
both worlds.